Elastic substance similar to india-rubber and its method of manufacture.



UNITED PATENT orinonf :LUCIEN ROLAND, OF PARIS, FRANCE.-

ELASTIC SUBSTANCE SIMILAR TO INDIA-RUBBER AND ITS METHOD'OF MANUFACTURE.

To all] whom it may concern) Manufacture, (for which a French patent has Y been filed March 13, 1906,) of whichthe fol-v lowing is a specification.

It has long been known that glycerin, gelatin, and chromic acid or its salts combined in certain proportions with or without water and then used or treated so that the water is evaporated forms an anhydrous tough material insoluble'in water. The disadvantages of this material are that it will not stand hard usage or heat. Now I have found that if these constituent materials be combined with a given quantity of water and then in their; liquid state run into molds of the de sired shape, wherein they are allowed to cool,

the molds being meanwhile exposed under normal conditions of temperature and pressure, the material will retain the waterof hydration and will set in a fewdays into a solid hydrated compound no longer containing free water andno longer soluble in water,

thoroughly stable, and capable of standin rou h usuage and heat up to atleast 100 D centigrade.

. Now by my present invention I use the above-mentioned reactions, but allowthe water of hydration to remain throughdut. in

the material as distinguished from the anhy-' soaked in cold water, preferably for from twelve to twenty-four hours, until they-have swollen up and are thoroughly soft. 'These are now melted in about fifteen kilograms of ordinary commercial glycerin testing 28 Baum. The mixture is now heated to a temperature of about 65 centigrade and thoroughly well stirred, and there is then added, with constant stirring, a hot solution,

at a tien'iperature which may var r from '50 to 100 contigrade, of about five undred' and sixty' grams of bichromate of potash and one hundred and forty grams of'bichromate of Specification of Letters Patent.

Application filed llliay 26,1906. Serial No. 318.924.

Patented Jan. 29, 1907.

material is run into molds, cooled, and allowed to set for afew days, when it is ready for use. Itwill replace rubber in ma nypf its applications, especially when rubber 1s 're.

quired as an elastic filling.

or mixture of bichromate with chromium alum may be em loyed. The substance thus obtained may be used in place of indiarubber in a large number of its applications and may serve more articularly for the manufacture of solid resilient tires for wheels of-vchicles, being introduced therein in place of the pneumatic tube.

Having thus described my said invention, what I claim is- I 1. An elastic substance analogous to caoutchouc, comprising a mixture of gelatin and of glycerin in a liquid state, withan aqueous solution of chromates or chromic acid, the quantity-of glycerin exceeding by about onetenth in weight; that of the gelatin, whilethe quantity ofchromates is equal to about fivehundredths of-- this quantity'of gelatin, the weight of water employed for dissolving these chromatcs being finally equal to about 'two times the weight-of the latter, alittle more or a little less according as the proportion of glycerininithe mixture is more or less strong, this water remaining inclosed inthe substance under the'form of water of consti tution, substantially as described.

2. The herein-described processconsistin in mixing glycerin, gelatin'and chromic aci or chromates with a quantity of water in the proportions specified, then allowing the mixture to set while reta'inin the water of hydration in combination w iereby is formed a solid hydrated compound'devord of free water and insoluble in water, substantially as described.

' soda in twelve hundred grams of Water. The l Bichromate of ammonia or other chromate 3. The herein described compound con--.

in the proportions specified. and devoid of free water, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of.

two subscribing witnesses.

, LUCIEN-BOLAND.

p Witnesses:

JULEs FAYQLLET,

EUGENE Pronon. a, 

